composer: limit subdependency version

Problem: The latest version of a dependency of a dependency is broken.

Solution: Mark this dependency version as conflicting in the main composer.json:

{

"conflict": {

"drupal/consumers": "1.22.0"

System Message: WARNING/2 (<stdin>, line 8)

Definition list ends without a blank line; unexpected unindent.

}

System Message: WARNING/2 (<stdin>, line 9)

Definition list ends without a blank line; unexpected unindent.

}